What is "Zos Toras ha'Chatas coming to teach us?
Ramban: It is coming to incorporate all Chata'os - even Chata'os ha'Penimiyos, in the Din of Kibus Begadim (in Pasuk 20).
Ba'al ha'Turim: Refer to 6:2:4:2*
And what does "Zos" then come to preclude?
Ramban: "Zos" precludes Chatas ha'Of from Kibus Begadim.
Why does the Torah change the order of Korbanos (Olah, MInchah, Chatas, Asham, Shelamim) from the order in Vayikra (Olah Shelamim, Minchah, Chatas, Asham)?
Ramban: Whereas in Vayikra, the Torah began with the Korb'nos Nedavah and went on to the Korb'nos Chovah, here it begins with Kodshei Kodshim and goes on to Kodshim Kalim. 1
This in turn, is because, to some extent, Kodshei Kodshim all share the same Din (See Pasuk 10 [Ramban]).
Why did the Torah fix the same location for the Shechitah of a Chatas as that of an Olah?
Rashi (in Sidur Rashi): Because of Kavod ha'Beriyos - If the Korban Chatas had its own specific location, everyone would know that whoever appears there with his Korban sinned. But now that it shares a location with an Olah, they will not know that it is not an Olah 1 that he is bringing.
Ramban: To incorporate all Chata'os in the Din of Tzafon, even Chata'os ha'Tzibur and Chata'os ha'Penimiyos. 2
Why does the Torah add "Kodesh Kodashim hi"?